text: "I understand why some countries want to vaccinate children and adolescents?
classes:  No, the safety of the vaccine has been proven, so I understand why some countries want to vaccinate children and adolescents.  Also, the safety of the vaccine has been proven, so I understand why some countries want to vaccinate children and adolescents.  Yes, the safety of the vaccine has been proven, so I understand why some countries want to vaccinate children and adolescents.